[boost] boost::array support for runtime-sized arrays

Recently I came up with a modified version of boost::array that supports runtime sized arrays. The current boost::array implementation is great but every now and then you'll need runtime-sized arrays: it's simply impossible to know everything at compile time. It is backwards compatible: boost::array<int, 10> sarray; but it can be used this way now: boost::array<int> darray(10); I realize you could simply use std::vector, but sometimes all you want is a fixed-size array (but sized at runtime). Besides, I am not sure about the overhead involved with std::vector for these simple scenarios. Comments welcome, Steven